There are a gajillion free horror comics on the web, including tons of old public domain stuff of the kind now being collected by many publishers. For a pretty good archive of PD and other, you cn’t go wrong with Diversions of the Groovy Kind’s post tagged “horror comcis”
including this gallery of Tomb of Dracula covers, from which this was taken. Ah, the good old days. Have some Doctor Strenge while you’re at it.